Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

Manly Sea Eagles prop Liam Knight allegedly sprayed insect repellent into his mouth after being arrested for drink driving and speeding at almost double the limit.

Knight has been stood down from the NRL club after he was charged for driving nearly 70km/h over the limit while having a high-range blood alcohol reading on Sydney's northern beaches yesterday morning, The Daily Telegraph reports.

The 21-year-old P-plater was allegedly driving at 137km/h in a 70km/h zone at 1.15am in Forestville.

Police claim that while in the back of the patrol car on the way to Frenchs Forest police station Knight grabbed a can of insect repellent and sprayed it into his mouth.

Once at the station, the footballer allegedly asked to use the toilet but was told he first had to submit to a breath test.

Officers said he refused to enter the room where the test would take place and had to be physically moved.

Knight's licence was immediately suspended after he returned a 0.176 blood alcohol reading.

He has been charged with high-range drink driving and excessive speeding and will face Manly Local Court on April 20.

"The Sea Eagles reported the incident to the NRL Integrity Unit this morning," the club said in a statement.

"The club will make no further comment until a thorough investigation is completed."